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SCUBA Diving Test NAUI Questions and Answers
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SCUBA Diving Test NAUI Questions and Answers
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SCUBA Diving Test: NAUI Questions andAnswers
What is the most commonly used tank today? - Answer -80 cubic-foot aluminum tank
What will the divers have to do when using the 80 cubic-foot aluminum tank? - Answer -
add 3 more pounds of weight
Should you leave a tank empty? - Answer -no
How full should you leave a tank at least? - Answer -300-500 psi
Cylinders are placed in water to avoid what? Why? - Answer --overheating
-the increase in heat causes a higher reading on the gauge
DOT ? - Answer --Department of Transportation stamp
-confirms the tank has been approved for use
-prior to 1970, ICC for Interstate Commerce Commision
ICC ? - Answer -Interstate Commerce Commision
"3AL E6498" - Answer --designates type of alloy
-in this case, aluminum
-not all have this exact same one, it is an example
"3000" - Answer --working pressure in pounds per square inch (psi) of the cylinder (in
this case aluminum)
-for old steel cylinders the working pressure is 2250 psi
-there are higher pressure cylinders on market today
-these tanks (higher pressure ones) would have a DIN valve (most commonly used on
steel high pressure tanks)
"123456" - Answer --serial number
-all tanks have a different one
"9(I)80" - Answer --stamped on neck of cylinder
-stamp is hydrostatic test date of cylinder
-(I) is the inspectors registered number or symbol
, The hydrostatic test must be completed every ____ ____. - Answer -5 years
Plus + - Answer --on steel cylinders only
-allows cylinder to be 10% over its working pressure
The diving industry requires that all cylinders be visually inspected. This inspection is
completed __________. What is placed on the cylinder to show that the test was
completed? Another inspection with the visual is a ____ ____ ____ of the threads in the
cylinder. - Answer --every year
-sticker is placed on side or bottom of cylinder after inspection
-metal stress crack
Eddie Current ? - Answer --not a required inspection (yet)
-some dive stores are requiring this inspection on your cylinder prior to filling for older
cylinders
Sport divers (us) use what type of regulator?
How many stages does it take to reduce the high pressure from the cylinder to the
diver? - Answer --demand valve
-2
First Stage of Reducing High Pressure from Cylinder:
the first stage attaches the _______ to the _________. From here, the high pressure
from the cylinder is reduced to about _____ psi. On the first stage are ports for
connecting your ______ _____ ________, _______ _______ ______, and ______
_______ _____ for your _______ compensator. There are a number of designs for the
first stage: from piston, _________ ________, _____, and balance diaphragm.
ALWAY put the _______ ______ back on the first stage after disconnecting the
regulator. Water should not enter the first stage of the ___________. - Answer --cylinder
to the valve
-130 psi
-high pressure gauge, low pressure octopus, and low pressure hose for your buoyancy
compensator
-balanced piston, diaphragm
-dust cap
-regulator
Second Stage Reducing High Pressure From Cylinder:
At this stage, the air pressure is reduced from the ______ to _______ psi to just ______
the ambient water pressure (_______ ________). The air chamber is separated from
the water by a flexible _________. When we inhale it causes a_______. This forces the
diaphragm ______. This allows an inlet valve to ______, and more air to enter. Some
styles of regulators are made to adjust the amount of ______ delivered to the diver. -
Answer --300 to 500 psi to just 10
-surrounding pressure
-diaphragm
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